Machine for straightening and truing band-saws



(N0 Model.)

J. E EMERSON. MACHINE FOR 'STEAIGHTENING AND TRUING BANDSAWS.

Patented Feb. 1, 1887.

Elk-wants z UNTTE STATES PATENT FFlCET JAMES E. EMERSON, OF BEAVERFALLS, PENNSYLVANIA.

MACHlNE FOR STRAIGHTENING AND TRUiNG BAND-SAWS.

SPECIFICATION forming part of Letters Patent No. 356,931, dated February1, 1887.

Application filed August 4, 1886.

I0 wZZ whom it Hwy concern.-

Be it known that l, Jliirns E. Ennnson, a citizen of the United States,residing at Beaver Falls, in the county of Beaver and State ofPennsylvania, have invented certain new and useful Improvements inMachines for Straight 'ening and Truing Wide Baud-Saw Blades, of

which the ibllowing is a specification, reference being had therein tothe accompanying draw i u gs.

The objectof this invention is to improve the means for straighteningand truing the blades or plates oflong bandsaws such as are used insawing logs into boards or planks which are fifty or more feet inlength, and which must not only be straight on their edges, but freefrom lumps or bends on the sides thereof; and the invention consists inthe construction of devices whereby the object of the invention isobtained, as will be hereinafter fully described.

In the drawings, Figure 1 represents a side view of the device. Fig. 2represents an enlarged view of a clamp or vise for holding an end of asaw-blade while it is being straightened and trued, and showing themeans by which the elongation of the blade is taken up, kept taut, andthe blade allowed to be turned over. Fig. 3 shows the bent condition ofsawblades before they are subjected to the operation of straighteningand truing.

Heretofore such band-saw blades have been straightened and trued bydrawing them by hand over the anvil upon which the blades werestraightened, which necessitated the use of a man at each end of theblade to manipulate it while being made true and straight, and a hand totest its straightness on its edges by a straight-edge; but by myimprovement in the devices the hammerman and one helper is all that isneeded, and even the helper may be dispensed with, as the hammer-man canmanipulate the saw-blade upon the anvil by himself.

My device is composed of a strong framework having sills A and uprightsA, and other strengthening parts (not shown) necessary to give a stableunyielding superstructure, in which the crooked or bent saw-blades aresecured before they are to be straightened and trued.

B is a springclarnp or vise having jaws 11 Serial No. 209,970. (Nomodel.)

and toothed plates I), to be forced by screw bolt B upon the sides ofthe blade at each end while being operated upon. The clamp B is swiveledupon swivel-bolt B, which goes through upright A, so that it can rotatethere on. Bolt B is screw-threaded on its outer end and extends adistance outside of upright A to receive a screw-nut, B. At the oppositeupright, A, is secured another clampvise, the same as that abovedescribed, except that instead of the bolt B, upon which the clamp turnsbeing a screw-bolt, it is firmly fixed to a sliding adjustable rod orbar, B, by rivets 1 1 or other secure means, and the adjustable rod B,when adjusted, is firmly held in place in upright A by theclamping-screws 2 2 or any other secure means.

0 represents the rails of a railway-track, consisting of the two rails,which are as near perfectly horizontal as possible and straight upontheir upper surfaces, and extend the entire length between the uprightsA and A.

G represents a strong car-frame secured to and upon car-wheels G, and sothat the car can be easily run upon track 0 in either direction by asmall amount of force.

D is the straightening-anvil, firmly secured upon the car 0, and havingits hammer-face d perfectly plane and parallel with the top of rails G.

E represents an upright or pair of uprights secured to the platform ofcar 0, to which or between which is secured toothed pinion F on shaft f,and with which it easily revolves by the crank f and handle f.

G represents a pair of uprights secured to the platform of car 0, andhaving a cap or plate, G, secured upontheir top ends, and a pair offlattening-rollers, g 57, therein or between the uprights, the roller ghaving its bearings secured in movable boxes 5 that slide in grooves inuprights G, by means of raisingscrews H and turning-winches 71; or butone screw H may be used; but two are preferred, in order to keep thebearing equal on all parts of the width of the plate.

I represents a saw-blade in Fig. 1 in position to be acted upon, and inFig. 3 it repre sents the saw-blades in their crooked condition andbefore they are straightened and trned.

The long blades for band'saws rarely, if

ever, come from between the rollers straight on their edges, and neverbut they have more orless bends in their sides. In Fig. 3 is shown someof the edgewise bends in these plates as they come from the rollers, andas it is necessary that band saw plates be practically straight upontheir edges, and the edges should also be practically parallel, hence aresort to hammering on the side of the saw-plate next the concave curve,diminishing the force of the blows toward the convex edge, so that theplate will by such hammering become practically straight, as isascertained by applying a straight-edge thereto, as the process of sohammering the plate stretches the concave edge until it becomes as longas its opposite edge, when the plate will be straight.

The plates of band-saws in hammering them to straighten their edgesbecome more or less indented by thehammer-strokes, and to equalize thisindentation upon opposite sides of the plate requires the plate to befrequently turned over upon the anvil, which is done easily, as thesaw-plate is placed into the clamp-Vises B at each end, and the toothedplates I) forced thereon by the screw B centrally upon the plates. Itcan then be turned over while so clamped by revolving the two clampsupon their swivel-bolts B. cess will lengthen the plate more or less,and as it is necessary to have the plate at all times taut as it restsupon the anvil, the screw-nut B upon the outside of upright A is turnedup hard againstupright Aon screw-bolt B, which keeps the plate at theproper strain over and upon the anvil.

As thelengths of the saw-plates differ, means to accommodate suchdifferences is had by riveting the swivel-bolt B to an adjusting-rod, B,that goes through upright A, and is secured therein when adjusted to thelength of plate.

The saw-plate I, as seen in Fig. 1, is in length the longest the framewill receive; hence a shorter plate will draw the rod 13 within theuprights and lessen the distance between the clamp-Vises.

The anvil D and car 0 are moved in either direction by turning the winchf, revolving pinion F, that gears into toothed wheel G, which is fast onshaft 9 of roller which revolves roller g, and when roller g is forceddown upon the saw-plate that is between rollers g and g the car 0 andanvil D will move in the direction desired, and the saw-plate will lieupon the face of the anvil in position to be hammered at any point themoving anvil may stop.

As the hammering pro- There may be side bends in the saw-plate besidesthe indentations made by the hammerstrokes, and such will be leveled ortaken out by the flattening-rollers g g as the saw-plateI passes betweenthem. Roller g is raised by the screw-shaft H to allow the plate I to berevolved when necessary.

The saw-plate can be changed end for end in the clamp-Vises, or the carand its anvil turned about so that the anvil will come up to theclamp-Vises at either end of the saw-plate.

The rollers g g are a trifle larger in diameter in the center of theirlengths, so that in passing over the plate it is slightly opened or.stretched more in the center of its widththan at its edges, so that whenthe saw is in operation and strained over its driving-pulleys the edgesof the saw will be most strained and be firm as the saw does itscutting, and is much less liable to tremble than when the tension isequal in its whole width. Thus these pressure-rollers perform severalfunctions-that is, by their revolution on the saw-plate the anvil ismoved under the whole length of the plate, the plate is flattened, andthe center in width, of the plate is opened or stretched by their use,completing their operation.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is-

1. In a device for straightening and truing band-saw plates, thecombination of the movable anvil D, underneath and in contact with thesaw-plate I, with the clamp-Vises B B, constructed to be adjusted tokeep the plate taut, and swiveled to allow the plate to be turned overupon the anvil, substantially as described.

2. In a device for straightening and truing band-saw plates, thecombination of the car 0, anvil D, rail-track G, rollers 99',gear-wheels G and F, with means for revolving the wheels, with thesaw-plate I, whereby the anvil is caused to travel underneath thesaw-plate, as described.

3. The combination of two rotatable clampvises, B B, one having a meansfor adjustingv the distance between the clamp-Vises by the bar B, andthe other constructed so as to take up the stretching of the plate inhammering by the screw-bolt B and nut B, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES E. EMERSON.

\Vitnesses:

R. Evans, W. W. Mnncnnnr, Sr.

IOO

